Shrinkage of semi-rigid materials like cement treated base subjected to thermal coupled with moisture has raised crack in semi-rigid base, which causes reflective crack in the asphalt concrete top layer. The deformation characteristics of cement treated base subjected to thermal coupled with moisture is researched through the strain acquired by the vibrating wire string gauge installed in the cement treated base while construction. And it is found that transverse deformation is larger than longitudinal strain which may raise greater stress in longitudinal direction as the restriction is stronger.

This article introduces the application of the MDD(Multi-depth Deflectometer) in the asphalt concrete concrete pavement. By analyzing its work principle, MDD was calibrated to get the real response of the pavement structure and reveals its true condition. It also introduces the details of the MDDS installation and illustrates the analysis of the typical response date, which is helpful for the further application of MDD in the asphalt concrete pavement design.

A new method for fatigue test is developed for semi-rigid pavement materials in this paper, which is much more reliable than the current method in domestic. The max deflection and max tensile strain among different specimens are compiled in flexural bending strength test. And the fatigue equation for lime fly-ash treated aggregate (LFTA) is established.

This article introduces the principle and equipment of FDR for detecting the water content of subgrade. It also demonstrates the details of the 5TM sensor’s installation. By comparing the water content between excavation subgrade and fill subgrade, it illustrates that subgrade form has a significant effect to water content of subgrade, which also provides powerful basis for regular maintenance of subgrade and ensures the normal operation of the highway.